CVE-2026-101099

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.39% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 32.8% of scored records. A rank, not a probability.

NVD base score

5.3 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-10-01.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-09-28 17:15Z1 MO AGO

Last updated

2026-10-01 14:37Z28 DAYS AGO

Reserved

2026-09-28

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 5.3)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X

Weaknesses

• CWE-755Improper Handling of Exceptional ConditionsClass

Data version

5.2

Document digest

f6b9047a73b57c7aecf77d5ff53081de76620158bf9a519dd72aa990e808dcdc

• vuldb.comVDB-410974 | ag-ui-protocol ag-ui Kotlin Community SDK SseParser.kt exceptional conditionhttps://vuldb.com/vuln/410974vdb-entry
• vuldb.comVDB-410974 | CTI Indicators (IOB, IOC, IOA)https://vuldb.com/vuln/410974/ctisignaturepermissions-required
• vuldb.comCVE-2026-101099 | CVE Analysis and Reporthttps://vuldb.com/cve/CVE-2026-101099third-party-advisory
• vuldb.comSubmit #934974 | ag-ui-protocol ag-ui v1.0 CWE-755https://vuldb.com/submit/934974third-party-advisory
• github.comhttps://github.com/ag-ui-protocol/ag-ui/issues/2442issue-tracking
• github.comhttps://github.com/ag-ui-protocol/ag-ui/pull/2657issue-trackingpatch
• github.comhttps://github.com/ag-ui-protocol/ag-ui/product